Kevin and Tom introduce us to the popular suburb of Arlington, Massachusetts, and to a new project: the first Italianate Style home THIS OLD HOUSE has tackled in years. Malcolm and Heather's 1872 home has seen some changes over the years, leaving it with an awkward layout. Now it's time to polish it and make it work for this century's busy family. Richard and Roger are on site to help the demolition work get started. In the second half of the hour, on ASK THIS OLD HOUSE, Tom demonstrates many uses for a router. Richard replaces an air conditioning unit that freezes when it runs. And the guys ask, "What is it?"